Create an ideal living environment: For Betta or other tropical fish, a cold water temperature is unbearable. They need a suitable temperature to stay active and healthy. As a complete temperature control system, heaters provide the right water temperature for your beloved fish. Let the fish live freely and happily in the comfortable environment you create. Perfect temperature adjustment control system: Only warm temperatures are not enough for Bettas health, it also requires a stable water temperature. heater has a perfect thermostat system with a temperature sensing module. It can be turned on and off automatically to ensure constant temperature. Simply turn the knob on the top of the heater and you will get the optimum temperature you need. Very Easy Durable Waterproof: Germany imported microcrystalline glass (glass ceramics), making Aquarium Heater shatterproof, wear-resistant, corrosion-resistant, easy to adapt to fresh water tanks or salt water tanks. Intensive Nichrome heating wire ensures s perfect heat transfer and longer service life. The top of the heater is sealed for greater water resistance. Maximum Thermal Safety For Fish: For the safety of your lovely fish, offers two thermal protection to ensure fish-safe. One, with thermal protection circuit, it can prevent overheating of Aquarium Heater. Two, a BPA-Free plastic case is included(Other brands dont have this) to prevent fish from coming into direct contact with the aquarium heater. FULLY SUBMERSIBLE: Perfect fit 2 to 10 gallons tank. Note: To prevent dry burning and malfunction, please ensure that the aquarium heater is completely submerged in the water. (Especially the turtle tank). You can put it at the bottom of the tank or vertically or tilted in the tank, but make sure the heater is FULLY SUBMERSIBLE. For good heating effect, prepare hoods or glass canopies for your tank and keep the water flowing